Can the bearing on the supercharger be changed sperate?

Wheel bearing most likely .

if it is a wheel bearing it should make more noise turning one way or the other,if it doesn't make a difference which way you turn it's not the wheel bearing

Sounds like you have a bearing failure either in the extension housing or at the rear of the impellers.
you can remove the extension housing by first removing the pulley at the front and removing the bolts at the rear of the housing where it meets the main body of the supercharger and slide it foreward if there is room.
I stripped down my supercharger after I had it reconditioned because the mechanic had left a small piece of aluminium shaving inside it and it jammed the impellers and it would not turn at all, I replaced all the bearings and seals as well and have had no more trouble so far.
I hope this helps you.

If is's making a clunking sound you need another supercharger. If it's whining a nose cone will fix it.

THE FRONT BEARING IN THE SUPERCAHRGER HAS GONE BAD. DO NOT DRIVE IT TIL' IT IS FIXED.
YOU WILL GET STRANDED AND MAYBE RUIN THE ENGINE IF PARTS GET SUCKED IN THE INTAKE.
ROBERT

Superchargers are notorious for going through bearings.However to narrow it down take a spray bottle of water and as the car is running squirt some water on the pulley .If the noise goes away for a bit then its the pulley if not then it may be coming from the supercharger bearings. You can take them apart if you're handy and change the bearings out,if not its off to your local garage I'm afraid.Good Luck

This is simple!!! I had the same problem in my GS. The part is called the supercharger coupling. It is made of nylon and can't be bought from the dealer BUT can be found in Ebay for about $30. This is a NEW part for the Eaton M90 supercharger. That is all it is!! The holes in the coupling wear slightly oblong creating a little bit of slop and it sounds TERRIBLE.

Be careful with the sealing surfaces behind the supercharger snout, reseal with a gasket maker (Loctite makes some) and refill with the correct fluid.

Remanufactured nose drive kits consisting of nose cone, drive pulley, lubricant,
sealant and coupler are available. The nose kits are an excellent alternative to replacing an
entire supercharger when dealing with low mileage bearing noise or leaky seal concerns.

This was from a service bulletin in June 2003.

the 3.8" supercharger (belt) pulley? You need a special tool as they are press fit.
www.intence-racing.com and www.3800performance.com

both carry it and offer the tool for rent as well.

Much of the noise comes from the coupler, however there are case (needle) bearings as well that wear, Those are much more difficult to replace.

These cars have a lot of problems with all the idler pulleys and the tensioner. You will most likely have to replace them.You may also want to check the harmonic balancer and make sure it is running true.Spin the supercharger by hand with the belt off,it should spin freely with no end play in the shaft to speak of.I hope this helps...Dan